The standard size Modular Handle is made from beautifully engineered anodized aluminum and will accept any of the tools in Sorby's Micro Tool System series. Though included in all the primary Micro Tool Sets (#89139, 89151, 89165, 89167, and 61848), the handle is available separately in case you need an extra, or to mix and match to create your own custom set of tools. Handle is 5-5/8" long x 7/8" in diameter. England